IMMUNOLOGY

Detailed explanation-1: -A healthy immune system can defeat invading disease-causing germs (or pathogens), such as bacteria, viruses, parasites-as well as cancer cells-while protecting healthy tissue. Understanding how the immune system works and how we can help protect our bodies is essential to the fight against the COVID-19 pandemic.

Detailed explanation-2: -In general, your body fights disease by keeping things out of your body that are foreign. Your primary defense against pathogenic germs are physical barriers like your skin. You also produce pathogen-destroying chemicals, like lysozyme, found on parts of your body without skin, including your tears and mucus membranes.

Detailed explanation-3: -Neutrophils-These are the most numerous type of innate immune responder cells. Their primary job is to destroy pathogens. Neutrophils circulate in the blood, but enter different parts of the body where an invader has been identified.